三电平逆变器SHEPWM优化方法的研究

Optimization Method for SHEPWM Applied to Three-level Inverter

以中点箝位型三电平逆变器(Three-level Inverter,简称TLI)为模型,提出了基于蚁群算法(Ant Colony Algorithm,简称ACA)求解非线性方程组的方法,求取特定消谐脉宽调制(Selective Harmonic Elimination Pulse Width Modulated,简称SHEPWM)的开关角度。ACA在求解非线性方程组时无需求解方程的初值,故加快了计算速度。用MatLab/Simulink仿真研究了消谐波的效果,并用IGBT搭建了中点箝位型TLI实验电路模型,对SHEPWM的消谐波效果进行了验证。实验结果证明了基于ACA的SHEPWM求解方法在TLI应用中的有效性。

An optimization method of the Selective harmonic elimination（SHE） technology is introduced based on ant colony algorithm applied to Neutral-point-clamped（NPC） three-level inverter, the thought, model and the solving method of colony algorithm are emphatically presented.The method don＇t need to determine the initial values when solving the SHEPWM nonlinear and transcendental equations.Simulative and experimental results showthat the optimization method is satisfactory and harmonic elimination is effective.